Laminated steel sheet for two-piece can, method for...

B - Operations – Transporting – 32 – B

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B32B 15/08 (2006.01) B65D 1/16 (2006.01) B65D 8/16 (2006.01)

Patent

CA 2617892

The laminated steel sheet for two-piece can satisfies the relation of the height h of the final formed body, the maximum radius r thereof, the minimum radius d thereof, with the radius R of circular disk, before forming, having the same weight to that of the final formed body, as [0.1 <= d/R <= 0.25] and [1.5 <= h/ (R - r) <= 4]. The laminated steel sheet has a polyester resin layer prepared by polycondensation of a dicarboxylic acid component and a diol component. The dicarboxylic component has terephthalic acid as the main ingredient, and the diol component has ethylene glycol and/or butylene glycol as the main ingredient. The quantity of copolymerizing ingredients is ranging from 8 to 16% by mole. The plane orientation factor of the resin is 0.06 or less.

L~invention concerne une feuille d~acier stratifiée pour une utilisation dans une boîte en deux parties, où la hauteur (h), le rayon maximal (r) et le rayon minimal (d) de l~article moulé fini ont la relation suivante : 0,1<=d/R<=0,2 et 1,5<=h/(R-r)<=4 où R représente le rayon d~une feuille non moulée en forme de disque d~un poids équivalent à celui de l~article moulé fini. La feuille d~acier stratifiée possède une couche de revêtement en résine polyester sur celle-ci. La résine de la couche de revêtement en résine polyester s~obtient par polycondensation entre une composante d~acide dicarboxylique et une composante diol, où la composante d~acide dicarboxylique comprend principalement de l~acide téréphtalique et la composante diol comprend principalement du glycol éthylène et/ou du glycol butylène. La couche de revêtement en résine polyester a une fraction molaire d~une composante copolymère comprise entre 8 et 16% en moles (inclus) et un coefficient d~orientation plane inférieur ou égal à 0,06.

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